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Recently i changed my 318is (1995) engine for 525i (1992) one. Almost everything seems to work properly. One of the major issues at the moment is that after driving for a while with warm (temp. gauge in middle) engine tachometer and fuel gauge start jumping and die/drop to 0. When turning on additional electrical devices (for example blow to max, fog lights or using power windows) then these gauges wake up and work a bit more or until i turn those additional devices off. Has anyone any idea about this weird problem?

Second issue is that my full OBC show very funny fuel consumption about 4-7L/100km on highroad but when fuel gauge is working it shows about 10L/100km.

I would really appreciate if anyone has opinions or possible solutions..
Regards,
RaunoV

You didn't swap in an instrument cluster for a 6 at the same time you replaced your 4 with a 6, did you? The 4 cylinder cluster will work, but it won't read correctly. You need a 6 cylinder cluster. Also, it sounds like your connections on the IC are loose.

You didn't swap in an instrument cluster for a 6 at the same time you replaced your 4 with a 6, did you? The 4 cylinder cluster will work, but it won't read correctly. You need a 6 cylinder cluster. Also, it sounds like your connections on the IC are loose.

Difference in 4cyl and 6cyl cluster is just how right rpm-s are, and I changed them also. This problem occurred on both clusters. Probably not connections cause both clusters had same issue and this is somethings to do with engine temerature?! Or somethings with electrical system...

Electrical system. And why do you think it can't be connections since it does it on both clusters? If the connector plugs are bad, that's exactly how it would react, showing the same symptoms on both clusters.

Electrical system. And why do you think it can't be connections since it does it on both clusters? If the connector plugs are bad, that's exactly how it would react, showing the same symptoms on both clusters.

And how could you explain that engine swap caused it? As before there wasn't any issues.